Yiddish
There has only ever been 1 Jewish country: Israel. The national language of Israel is Hebrew.
Philology is the study of how language was developed throughout history.
The developed a written language.
The developed a written language.
The developed a written language.
The developed a written language.
They developed written language
They developed a written language.
When Jews moved north of the Alps into the Rhineland, they developed Yiddish. Yiddish must have started as a pigeon language mixing Germanic and some French words with a smattering of Hebrew. The Jewish community of this era was literate, and as this language grew from a pigeon language to a creole language, they began to write it down. Later, as Jews moved east into Poland and Russia, a layer of Slavic loan words crept into Yiddish.
According to Irishlanguage.net (see Link) under the headings: History of the Irish Language Stages of the Irish language It was developed before the 4th century
written language developed by the Aryans